diff --git a/gradle.properties b/gradle.properties
index 24e9516d..f30109b8 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -2,4 +2,4 @@ org.gradle.parallel=true
 kotlin.mpp.stability.nowarn=true
 kotlin.native.ignoreDisabledTargets=true
 org.gradle.jvmargs=-Xmx4G
-ksp.useKSP2=false
+ksp.useKSP2=true
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 5aae7393..973b03c4 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -12,7 +12,7 @@ detekt-formatting = { module = "io.gitlab.arturbosch.detekt:detekt-formatting",
 ksp = { module = "com.google.devtools.ksp:symbol-processing-api", version.ref = "ksp" }
 kotlin-reflect = { module = "org.jetbrains.kotlin:kotlin-reflect", version.ref = "kotlin" }
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
-kotlin-compile-testing = { module = "dev.zacsweers.kctfork:ksp", version = "0.4.0" }
+kotlin-compile-testing = { module = "dev.zacsweers.kctfork:ksp", version = "0.5.0-alpha03" }
 kotlinx-coroutines = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version = "1.8.0-RC2" }
 kotlinx-metadata-jvm = { module = "org.jetbrains.kotlinx:kotlinx-metadata-jvm", version = "0.9.0" }
 kotlinx-atomicfu = { module = "org.jetbrains.kotlinx:atomicfu", version = "0.23.2" }
diff --git a/kotlin-inject-compiler/test/src/main/kotlin/me/tatarka/inject/ProjectCompiler.kt b/kotlin-inject-compiler/test/src/main/kotlin/me/tatarka/inject/ProjectCompiler.kt
index cfa66c53..09dbe57a 100644
--- a/kotlin-inject-compiler/test/src/main/kotlin/me/tatarka/inject/ProjectCompiler.kt
+++ b/kotlin-inject-compiler/test/src/main/kotlin/me/tatarka/inject/ProjectCompiler.kt
@@ -6,7 +6,7 @@ import com.google.devtools.ksp.processing.SymbolProcessorProvider
 import com.tschuchort.compiletesting.CompilationResult
 import com.tschuchort.compiletesting.KotlinCompilation
 import com.tschuchort.compiletesting.SourceFile
-import com.tschuchort.compiletesting.kspArgs
+import com.tschuchort.compiletesting.kspProcessorOptions
 import com.tschuchort.compiletesting.kspWithCompilation
 import com.tschuchort.compiletesting.symbolProcessorProviders
 import me.tatarka.inject.compiler.Options
@@ -48,7 +48,7 @@ class ProjectCompiler(
                 sources = sourceFiles
                 when (target) {
                     Target.KSP -> {
-                        options?.toMap()?.let { kspArgs.putAll(it) }
+                        options?.toMap()?.let { kspProcessorOptions.putAll(it) }
                         symbolProcessorProviders = mutableListOf<SymbolProcessorProvider>().apply {
                             add(InjectProcessorProvider())
                             addAll(symbolProcessors)